How do I split an IDW template such that two vies can be placed on it

See more:

C#

WinForms

I have a requirement such that I have to place two base views of assemblies(.iam) on a template file(.idw). The first assembly view should be on the top half and the other should be on the lower half of the template. I am able to place views but I am not sure how to get the center point of the template(.idw). I tried following the code given in
The code I am writing is

string pth = folderpath + "\\" +comboBox1.SelectedItem;  
                NameValueMap oMap = oApp.TransientObjects.CreateNameValueMap();                
                DrawingDocument oDrawDoc =(DrawingDocument)oApp.Documents.Add(DocumentTypeEnum.kDrawingDocumentObject,pth);
                oDrawDoc = (DrawingDocument)oApp.ActiveDocument;
                Sheet oSheet = (Sheet)oDrawDoc.ActiveSheet;                
                //DrawingView dv = default(DrawingView);
                //dv = (DrawingView)oSheet.DrawingViews;
                Point2d oCenter = oApp.TransientGeometry.CreatePoint2d(10.0,10.0);
                //Point2d oCenter = (Point2d)dv.Center;
                //Point2d oPlacementPoint1 = oApp.TransientGeometry.CreatePoint2d(oCenter.X - 1, oCenter.Y);
                //Point2d oPlacementPoint2 = oApp.TransientGeometry.CreatePoint2d(oCenter.X + 1, oCenter.Y);
                Point2d oPlacementPoint1 = oApp.TransientGeometry.CreatePoint2d(4.0,20.0);
                Point2d oPlacementPoint2 = oApp.TransientGeometry.CreatePoint2d(oCenter.X, oCenter.Y);
                ViewScale1 = 1.0;
                ViewScale2 = 1.0;
                ViewOrientationTypeEnum ViewOrientation1 = ViewOrientationTypeEnum.kLeftViewOrientation;
                ViewOrientationTypeEnum ViewOrientation2 = ViewOrientationTypeEnum.kRightViewOrientation;
                DrawingViewStyleEnum ViewStyle1 = DrawingViewStyleEnum.kHiddenLineDrawingViewStyle;
                DrawingViewStyleEnum ViewStyle2 = DrawingViewStyleEnum.kShadedDrawingViewStyle;
                AssemblyDocument oAssDoc =(AssemblyDocument)oApp.Documents.Open(textBox1.Text,false);
                AssemblyDocument oAssDoc2 = (AssemblyDocument)oApp.Documents.Open(textBox2.Text, false);                
                DrawingView oView=oSheet.DrawingViews.AddBaseView((_Document)oAssDoc,oPlacementPoint1,ViewScale1,ViewOrientation1,ViewStyle1);
                DrawingView oView2 = oSheet.DrawingViews.AddBaseView((_Document)oAssDoc2, oPlacementPoint2, ViewScale2, ViewOrientation2, ViewStyle2);
                oAssDoc.Close();
                oAssDoc2.Close();

The problem I am facing is on the line

//DrawingView dv = default(DrawingView);
                //dv = (DrawingView)oSheet.DrawingViews;

It throws an exception cannot cast a _COM to Inventor.DrawingView. Any idea how to get the center points of the template??

Any help is appreciated. Thanks in advance